Astronomy and Celestial Phenomena

The moon illusion is primarily caused by atmospheric refraction - light bends as it passes through different density layers of Earth's atmosphere, especially near the horizon. This refraction makes celestial objects appear larger when low in the sky. Total internal reflection, scattering, and diffraction don't cause this effect.

The plural subject 'meteors' requires the plural verb 'enter'. When meteors enter Earth's atmosphere, friction causes them to lose much of their mass as they burn up.

Apogee is the point in the moon's elliptical orbit where it is farthest from Earth's center. This occurs because the moon's orbit is not perfectly circular but elliptical, with Earth at one focus. The opposite point (closest distance) is called perigee.

Neptune takes about 165 Earth years (approximately 60,190 Earth days) to complete one orbit around the Sun due to its vast distance - about 30 times farther from the Sun than Earth is.

Earth orbits the Sun in an anticlockwise direction when viewed from above the North Pole. This is the same direction as most planets in our solar system due to the conservation of angular momentum from the solar nebula.

A lunar eclipse can only occur during a full moon when the Sun, Earth, and Moon are aligned in a straight line with Earth in the middle. The Earth's shadow then falls on the Moon's surface. During a new moon, the moon is between Earth and Sun, making a solar eclipse possible instead.

 We always see the same face of the moon, because it takes equal time for revolution around the earth and rotation on its own axis.

Rotation of Earth on its axis causes day and night but the revolution of Earth on a tilted axis causes the variation in the length of daytime and night time.

Light from the Sun takes approximately 8 minutes and 20 seconds to reach Earth, which is about 499 seconds. This is based on the average distance of 150 million kilometers between Earth and Sun, and the speed of light at 300,000 km/s. The precise value varies slightly due to Earth's elliptical orbit.

Earth Revolve around the sun in the elliptical orbit

Earth Hour is about climate change awareness and energy conservation. While 'energy crisis' is not the modern framing, the event emphasizes reducing energy consumption. The answer is technically correct as the event relates to energy issues.

The average Earth-Sun distance (approximately 149.6 million km) defines one astronomical unit (AU). A light year is the distance light travels in one year, while a solar day is Earth's rotation period. The term solar day is sometimes used to describe Earth's orbital position relative to the Sun, though this is less common terminology.

The corona is the Sun's outer atmosphere consisting of extremely hot plasma (temperatures in millions of degrees). It appears as a halo or crown around the Sun and is most visible during total solar eclipses or with specialized telescopes called coronagraphs.

During the Perseid meteor shower, Earth passes through debris from Comet Swift-Tuttle, causing visible streaks of light (meteors) across the night sky. The sky does not become overcast or too bright - meteor showers are best visible in dark, clear skies.

The new moon phase occurs when the moon is between Earth and the Sun, with its illuminated side facing away from Earth. This makes the moon virtually invisible from Earth. During this phase, the moon rises and sets approximately with the Sun, so it's not visible in the night sky. A crescent moon shows a sliver of light, full moon is fully illuminated, and waxing/waning refer to the transition between phases.